1321312997 has 2 divisors, whose sum is σ = 1321312998. Its totient is φ = 1321312996.

The previous prime is 1321312919. The next prime is 1321313033. The reversal of 1321312997 is 7992131231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 697012801 + 624300196 = 26401^2 + 24986^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321312997 - 2¹⁰ = 1321311973 is a prime.

It is a super-2 number, since 2×1321312997² = 3491736072082244018, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1321312997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321312697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660656498 + 660656499.

It is an arithmetic number, because the mean of its divisors is an integer number (660656499).

Almost surely, 2^1321312997 is an apocalyptic number.

It is an amenable number.

1321312997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321312997 is an equidigital number, since it uses as much as digits as its factorization.

1321312997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412, while the sum is 38.

The square root of 1321312997 is about 36349.8692844967. The cubic root of 1321312997 is about 1097.3249038245.

The spelling of 1321312997 in words is "one billion, three hundred twenty-one million, three hundred twelve thousand, nine hundred ninety-seven".